Grate construction



jolt Inventor Attorney:

Oct. 14, 1930.

J. L. DRAGON GRATE CONSTRUCTION Original Filed Jan. 12, 1928 Patented Oct. 14, 1930 PATENT OFFICE JOSEPH L. DRAGON, OF MONTREAL, QUEBEC, CANADA GRATE CONSTRUCTION Application filed January 12, 1928, Serial No. 246,318, and in Great Britain April 25, 1927.

o Renewed August 30, 1930.

The present invention relates to'improvements in furnace grates and has for its primary object to provide a grate adapted particularly for eifi'ciently burning relatively small coal. i

A further object of the invention is the provision of a grate arranged to provide a suitable continuous draught for eflicient combustion of the fuel.

Another object ofthe invention is the provision of a grateof the above character constructed so as to reduce to a minimum the probability of clogging the draught recesses.

Still another object of the invention is the provision of a grate designed so that the component grate bars will be maintained in a relatively cool condition so as to increase the durability of the grate.

A st ill further object of the invention is the provision of a grate which will be solid and compact in operative position so as to avoid displacement of the component bars.

V Other objects and advantages of the invention will become apparent as the description progresses.

In the accompanying drawing forming a part of thisspecification and in which like reference characters are employed to designate coresponding parts throughout the same Figure 1 is a perspective view of one of the grate bars, j v

Figure 2 is a similar view of a central grate bar, V

Figure 3 is a similar view of a base bar,

Figure 4 is a plan view of a grate of circular form constructed in accordance with the invention,

Figure 5 is an enlarged fragmentary transverse section through the assembled grate, and

Figure 6 is a vertical transverse section taken on the line 66 of Figure 4.1

Referring to the drawing wherein is illustrated a preferred embodiment of-the invention, the numeral 1 generally designates one of the base bars of the grate, this bar having a tapered substantially V-shaped cross section diminishing toward the upper edge. Formed transversely at regular intervals in the upper portion of the base bars are V-sh'aped notches,

indicated at 2, forming intermediate pyramidal projections 3. In assembly, a series of grate bars of the above structure are arranged in parallel positions in the common forms of grates, although it is also intended to form the 5 same in annular circular form.

In the preferred construction and assembly of the grate, it is intended to provide a central grate bar 4 having a. tapered body triangular in cross section diminishing to the lower edge B0 5, this structure being designed for suitable engagement with the central notches of the base bars. The upper surface of the centre bar 4 is formed with a relatively narrow longitudinal rib 6 arranged on the longitudinal centre of the bar and adapted to provide downwardly inclined support shelves 7 at the upper side portions of the bar. This central bar will be disposed transversely across the centre of the grate and the side bars will be extended in parallel positions.

The side bars, desi nated at 8, embody body sections of. tapered substantially V-shaped cross section diminishing towards the lower edge 9. One of the upper longitudinal edges of each side bar is formed with a laterally projecting continuous tapered flange 10, the top being flat and in horizontal continuation with the upper surface of the bar. he outer edge of the'flange, indicated at 11, is formed so to extend in a substantially vertical plane while the bottom surface 12 is inclined slight- 1y upward from the horizontal. A series of spaced lugs 13 are formed on the bottom of the flange for a purpose which will be later described. The opposite upper side edge of each of the side barsisrabbeted to form a downwardly inclined shelf 14 having an inclination corresponding to that of the bottom surface of the flange 10. The inneredge 15 of the rabbet is-designed to form a substantially vertical surface adapted to assume a position parallel with respect to the outer edge 11 of the adjacent flange. These side bars are formed to be fitted in the notches 2 of the base bars in parallel positions and are arranged so that the upper flat surfaces will extend in a co-extensive horizontal plane.

In the assembly of the grate, the base bars 1 are initially fitted in the furnace, either 1 supported upon a peripheral ring or positioned upon the common form of grate support in parallel positions. The centre grate bar t is initially positioned in the central aligned notches of the base bars. he side grate bars are then successively positioned in the notches of the base bars from the centre to the outer edge of the grate. From this construction, it will be obvious thatthe removal of the bars can be effected only by successive separation of the bars from the outer edges of the grate towards the centre, thus forming a compact grate.

Vy hen thus assembled, the flanges of the grate bars arranged at opposed sides of the central bar will overhang the rabbeted portions of the centre bar, the lugs formed on the bottom of the flanges resting on a shelf like projection thereof. The outer edge 11 of each flange will be spaced a predetermined distance from the side edges of the rib 6 to form a. longitudinal continuous crevice therebetween in communication with the interstiees formed between the lugs. In a similar manner, the outer edges of the side bar flanges will be spaced from the inner edge 15 of the rabbet formed in the co-acting edge of the adjacent side bar to provide longitudinal continuous crevices formed in substantially vertical arrangement in the grate. These crevices, formed in the surface of the grate, are relatively narrow and substantially equal to the spaced interstices formed between the bottom of the flanges and the shelf 13 to provide an angular draught passage through the grate designed to prevent the passage of the comparatively small particles of coal and at the same time permit the discharge of an unobstructed draught through the grate.

It is to be understood that the form of my invention herein shown and described is to be taken as a preferred example of the same, and that various changes as to the shape, size, and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the subjoined claims.

Having thus described my invention, I claim 1. A grate comprising a plurality of grate bars provided with angular recesses in their upper outer edges, laterally projecting flanges formed 011 the opposed upper edges of the grate bars adapted to overhang the shelf of the adjacent grate bar, and a plurality of spaced projections formed on the under sides of the flanges resting on the shelves of the adjacent grate bar to provide draught openings between the flanges and the shelves.

2. A grate comprising a plurality of grate bars, each grate bar having one upper edge rabbeted to form an inclined shelf, a continuous flange projecting laterally from the opposedupper edge of each grate bar, and a plurality of transversely extending lugs to med at spaced intervals on the lower surface of the flange adapted to rest upon the shelf of the adjacent grate bar.

3. A grate comprising a plurality of grate bars, each grate bar being formed with a continuous rabbeted recess at its outer upper edge providing a continuous shelf, a laterally projecting flange formed at the opposite upper edge of each grate bar adapted to overhang the shelf of the adjacent grate bar, and transversely extending lugs formed on the lower surface of the flange at spaced intervals adapted to rest upon the shelf of the adjacent grate bar, the upper surfaces of the grate bars being arranged in a continuous horizontal plane in operative position.

t. A grate comprising a plurality of base bars. a plurality of grate bars arranged in parallel positions on the base bars, each grate bar having a tapered body portion engageable with the base bars, the outer edge of each grate bar being rabbeted to form an inclined shelf disposed outwardly of and below the upner surface of the bar, a laterally projectino' flange ormed at the opposed upper longitudinal edge of the grate bar adapted to overhang the shelf of the adjacent grate bar in operative position, a plurality of spaced lu formed on the lower surface of the flange arranged at an angular position and adapted to rest upon the shelf of the adjacent grate bar. the upper surface of the grate bar being disposed in a horizontal plane in operative position.

5. A grate comprising a plurality of base bars having V-shaped notches in their upper edges, a central. grate bar having a tapered body diminishing towards its lower edge adapted to be fitted in the notches of the base bars. an upwardly projecting rib formed longitudinally on the centre of the central.

bar providing lateral shelves at the upper portion thereof, and a plurality of companion grate bars adapted to be fitted in the notches of the base bars formed with laterally extending flanges overhanging the sides of the cen-- tral bar and each other.

6. A grate comprising a plurality of grate bars adapted to be supported in horizontal arrangement, each grate bar being formed to provide a horizontal top surface rabbeted at one upper side edge to form a depressed shelf. a laterally projecting flange formed on the opposite upper ed e. a plurality of spaced lugs formed on the lower surface of the fl nge adapted to rest upon the shelf of the adjacent grate bar, the grate bars being arranged inoperative position so that the outer ed e of the flange will be s aced from the opposed edge of the rabbet in the adjacent bar to provide a flat grate surface formed withparallel continuous draught crevices in communication with the interstices formed between the lugs of the flanges to provide a suitable draught through the grate.

7. A grate comprising a plurality of. grate lfll) bars adapted to be supported in horizontal position, each bar being of substantially triangular formation, the grate bars being arranged so that in operative position the upper flat surfaces will be disposed in a'horizontal plane, and provided at one upper edge with a rabbeted recess formed to provide an inclined shelf, a laterally projecting flange formed on the opposed upper edge of eachgrate bar formed with an inclined bottom portion corresponding to the inclination of the shelf, a plurality of spaced lugs formed on the bottom of the flange adapted to rest upon the shelf of the adjacent bar, the bars being arranged in operative position so that the outer edge of each flange will be spaced from the opposed edge of the recess upon the, adjacent bar to provide a continuous crevice in communication with the interstices formed between the lugs of the flanges.

8. A grate comprising a plurality of grate bars formed with a support shelf arranged below the top surface of the bar at one of the edges, and a laterally extending flange projecting from the opposed upper edge carrying spaced lugs on its under side disposed to rest upon the shelf portion of the adjacent bar.

In witness whereof I have hereunto set my 7 hand.

JOSEPH L. DRAGON. 

